Implement tagged_logger by hand

[JonRowe]

Similar to #2461, rather than use Rails modules verbatim, vendor the import part of what they do (in this case define the private tagged_logger method) so we have less of an overlap. In particular the actual module does this:

def before_setup
  if tagged_logger && tagged_logger.info?
    heading = "#{self.class}: #{name}"
    divider = "-" * heading.size
    tagged_logger.info divider
    tagged_logger.info heading
    tagged_logger.info divider
  end
  super
end

Which is what is causing issues for #2624

[pirj]

So much better, thank you!

[JonRowe]

This has been released in 6.0.1